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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
54
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.52g CO2 per view
FIX
1.52g CO2 per view
Warning::
1.52g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.52g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.26g, end-user device 0.98g.
Got: 1.52g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 182.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 182.9 kg of CO2 annually — equivalent to charging 22862 smartphones.

1.52g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 24% of websites

Sustainable Web Design model v4 · Page size: 5.4 MB

Your site
1.52g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.28g
Network
0.26g
End-user device
0.98g
At 10,000 monthly views: Monthly: 15.2 kg · Annual: 182.9 kg · ≈ 22862 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
76th percentile
FIX
76th percentile
Warning::
1.52g CO2 — above the median website (0.60g)
Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 76th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.52g

76th percentile

Cleaner than 24% of websites

✗ Above the median website

vs Median 154% more
vs Target 205% more
C
Transfer Efficiency
Action
63% efficient
REVIEW
63% efficient
Warning::
Transfer efficiency: 63%
An estimated 2015 KB (37%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2015 KB of unused JavaScript. This wasted data produces 0.56g of unnecessary CO2 per page view.
63% efficient

Total waste: 2015 KB (37% of page weight)

Unused JS 2015 KB

0.56g unnecessary CO2 per visit

Actual transfer 5511 KB
Theoretical minimum 3495 KB
Potential savings 2015 KB (0.56g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 213 KB (vs 5511 KB first visit). 115 of 119 resources are served from browser cache, saving 1.47g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.52g)
First visit
5511 KB
Repeat visit
213 KB

96% reduction on repeat visits

Saving 1.47g CO2 per returning visitor

115 resources served from cache · 4 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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